Telemeter



(No Modem y C. GULLIKSEN.

TBLEMETER. 170,589,527. Patented Sept. 7,1897.

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C. GULLIKSEN.

` TELBMETER. No. 589,527. Patented Sept. 7,1897.

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CHARLES GULLIKSEN, OF GRAND'FORKS, NORTH DAKOTA.

lTELEMETERl SPECIFICATION forming part of Letters Patent No. 589,527",dated September 7, 1897.

Application filed Merch 30,1897. Serial No. 630,005. (No model.)

My invention relates to a novel form of te-4 lemeter, and the object isto provide a simple and convenient device whereby a person mayvapproximate the distance of a point or object Without the aid ofcomplicated mathematical calculation; and to this end the noveltyconsists in the construction, combination, and

arrangement of the saine, as Will be hereinafter more fully described,and particularly pointed out in the claims.

In the accompanying drawings the same reference-characters indicate thesame parts of the invention.

Figure lisa diagrammatic plan view of my improved telemeter. Fig. 2 is amodification of the same. Fig. 3 is an enlarged longitudinal section ofthe tube. Fig. 4l is a longitudinal section on the line 4 it of Fig. l.Fig. 5 is a transverse section on the line 5 5 of Fig. l, and Fig. G isa longitudinal section on the line G 6 of Fig. l.

l represents a cylindrical tube provided with two diaphragme 2 3, havingthe central alined visual apertures 4; 5.

G represents a rectangular frame lined to one end of the tube and at aright angle to a line taken through the apertures et 5.

7 represents a prism secured in said frame and having its contiguousplane face arranged parallel with the frame and at a right angle to theline of vision through the tube.

S represents a sliding carriage in which the tube is mounted, and Si atrack on which the carriage slides, and l0 represents a graduated scaleor index fixed on the traclnplatform, so as to be traversed bythepointer 1:2, fixed on the carriage.

According to the Well-known laws of refraction, a point or object viewedthrough the prismdens 7 will be retracted or deiiected from a straightline, the degree of refraction dependiu g on the angularity of theprism.

Consequently the distance of an object from the point of vision can beapproximately determined by taking advantage of this law of refraction,and to do this it is onlynecessary to remove the prism and bring theobject in line with the tube when the pointer on the carriage is at thezero-point on the scale and then replace the prism and move the tube andcarriage along the track until the object is brought into the line ofvision through the prism When viewed through the tube and the distanceread off on the scale.

In order to increase the scope of the telemeter, several prisms havingdifferent angles may be employed and correspondingly graduated scalesarranged on the platform.

In the modification I have dispensed with the carriage and track andmounted the tube on a vertical shaft fired in the platform, a pointer ont-he tube traversing the scale to in dicate the degree of horizontalmovement of the tube.

In some instances the tube may be provided With ordinary telescopiclenses to increase its efficiency.

Although I have specifically described the construction and relativearrangement of the several elements of my invention,-I do not desire tobe confined to the same, as such changes or modifications may be made asclearly fall Within the scope of my invention Without departing from thespirit thereof.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-- 1. Atelemeter comprising asupport, a movable carriage mounted on the support, a sighttube mountedon the carriage, a detachable prism in the tube, and aiixed scale andmovable pointer, substantially as described.

2. The movable carrriage S, provided with the pointer l2, the tube l,provided with the prism 7 mounted on said movable carriage, and thestationary track provided With the fixed scale l0, substantiallyas shownand described. y

In testimony whereof I hereunto affix my signature in presence of twoWitnesses.

CHARLES GULLIKSEN.

Witnesses:

A. G. BERE., M. Listener).

